Re: How to retrieve buffer from struct uio ?
Re: How to retrieve buffer from struct uio ?
- Subject: Re: How to retrieve buffer from struct uio ?
- From: Terry Lambert <email@hidden>
- Date: Tue, 12 Sep 2006 02:53:07 -0700
On Sep 12, 2006, at 2:13 AM, sanjay yaragatti wrote:
Hi all,
I am writing a kernel driver.I have regestered it
as character device. I am unable to implement the
device write method (dev_write( dev_t device, struct
uio *uio, int ioflag)) since I don't know how to
retrieve the buffer from struct uio.
However on trying to dereference uio as
uio->uio_iov->iov_base gave a compilation error.
Is there a KPI to retrieve the buffer sent from user
space?
You may want to read /usr/include/sys/uio.h...
/*
* uio_curriovbase - return the base address of the current iovec
associated
* with the given uio_t. May return 0.
*/
user_addr_t uio_curriovbase( uio_t a_uio );
You can also look at the kernel sources; in this case, the function is
implemented in:
<http://www.opensource.apple.com/darwinsource/10.4.7.ppc/xnu-792.6.76/bsd/kern/kern_subr.c
>
-- Terry
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